Adding Snow

I'm trying to make it snow on my website using HTML but everytime i paste the code into the HTML it doesn't work. My site is https://www.snipersquad.pro/

Try this code

<center><img src="https://1.bp.blogspot.com/-c-K3Pat4jgs/X7dBQ4q9DWI/AAAAAAABh1s/aFZ0_bnfvjEX7094zKqXWj0NPmSxd3_jgCLcBGAsYHQ/s500/MontBlanc02.gif" width="546" height="304"><center>